GATE | GATE CS 2021 | Set 2 | Question 53

Consider a computer system with multiple shared resource types, with one instance per resource type. Each instance can be owned by only one process at a time. Owning and freeing of resources are done by holding a global lock (L). The following scheme is used to own a resource instance:

function OWNRESOURCE(Resource R)
    Acquire lock L // a global lock
    if R is available then
        Acquire R
        Release lock L
    else
        if R is owned by another process P then 
        Terminate P, after releasing all resources owned by P  
        Acquire R  
        Restart P
        Release lock L
        end if
    end if    
end function

Which of the following choice(s) about the above scheme is/are correct?

(A)

The scheme ensures that deadlocks will not occur

(B)

The scheme may lead to live-lock

(C)

The scheme may lead to starvation

(D)

The scheme violates the mutual exclusion property

Answer

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